Is it? My protocol books simply indicate FR is just special framing and
timing is actually rather loose (mainly dealing with LMI update
frequency).
What exactly about FR is hard realtime (except for synchronous
communications, which is an issue with "regular" HDLC as well)?
> Sangoma cards support frame for one, and there may be others. They all
> tend to run the frame relay protocol off card. Mike McLagan's dlci
> modules are for the Sangoma boards.
Linux could better support FR by supporting marking certain traffic as DE
(discard eligible).
ipchains looks like a good way to do this. Except that the DE information
is (to tcp) OOB data. So you cant just fiddle with TCP packet headers you
need a way to tell the FR interface to mark the frame header as DE before
it sends it out.
At least cisco IOS can do this (eg mark NNTP traffic as DE but leave
everything else alone).
-Dan
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